Convert between Celsius, Fahrenheit, and Kelvin. Users enter a value and select the source unit. Show conversions to all other units instantly.
Converting between temperature scales is a common requirement for scientists, cooks, and travellers alike. The three most common scales are Celsius, Fahrenheit, and Kelvin. This Calculator Site tool provides a simple way to convert between them. Understanding the underlying formulae is key to appreciating how they relate.
To convert from Celsius to Fahrenheit, multiply by 9/5 and add 32. To go from Fahrenheit to Celsius, subtract 32 and multiply by 5/9. The Kelvin scale is simpler: it is an absolute scale where 0 K is absolute zero. To get Kelvin from Celsius, you just add 273.15. For more specific needs, check out our Oven Temperature Converter.
A Curious Coincidence
Did you know there is a point where the Celsius and Fahrenheit scales intersect? At -40 degrees, the temperature is the same in both units. -40°C is exactly equal to -40°F. It is the only point where the two linear scales cross paths.
Certain temperatures serve as critical reference points in science and daily life. Understanding these benchmarks helps contextualize different temperature readings. For other physical measurements, our Weight Converter can be very useful.
0 K
Absolute Zero
0°C
Water's Freezing Point
100°C
Water's Boiling Point
How to use this Calculator Site tool
Enter any number into the input field at the top of the page. Select the unit you are converting from (°C, °F, or K) using the dropdown menu. The calculator will instantly show the equivalent values in the other two units in the conversion boxes. No need to press a button!
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